7a-(Hydroxy(methoxy)methyl)-2,2,4,4-tetraisopropyl-6a,7a,13a,13b-tetrahydro-6H,11H-[1,3,5,2,4]trioxadisilocino[6'',7'':4',5']furo[2',3':4,5][1,3]oxazolo[3,2-a]pyrimidin-11-one AIDS-148487 AIDS148487 NSC680837